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Halacha
The shape of the month: what is counted, what is checked, and when. Read this to understand how it works — and ask a person about anything that is actually yours.
This page cannot answer a she’elah. It describes the general practice, in the mainstream Ashkenazi and Chabad form. Real questions turn on details — a date, a color, a medication, a procedure, what happened last month — and a page cannot ask you for any of them. Where you see “ask a rav” below, that is not a disclaimer. It is the instruction.
A woman is niddah from the onset of her period until she immerses in a Mikvah. During that time a husband and wife do not have physical contact — not only intimacy, but touch generally: no hugging, no hand-holding, no passing an object directly from hand to hand, and separate beds. These separations are called harchakot, and there is a defined list of them.
After immersion, all of it resumes at once, and continues until the next period begins. Two states, and one act of immersion moving from the first to the second.
The harchakot are learned, not guessed at. They are one of the standard subjects a bride learns before her wedding, and one of the things a woman coming to this later sits down and goes through with a teacher.
The count starts from the onset of bleeding. It is counted in Hebrew days, which begin at nightfall rather than at midnight — so a period that starts on a Tuesday evening and one that starts on Tuesday afternoon are on different counts, a day apart. That single fact is behind a great many of the questions people ask, and it is worth checking rather than assuming.
In Ashkenazi practice, which is what is followed here, a minimum number of days is counted from onset before the clean days may begin — conventionally five, counting the day bleeding began as the first. Sephardi practice differs, and there are individual circumstances in which a rav directs otherwise. If your family custom is different from your husband’s, or you do not know what yours is, that is a question worth asking once and then knowing for good.
The hefsek Taharah is the examination that establishes bleeding has stopped, and it is the gate everything else waits behind. Late in the afternoon, before sunset, a woman washes, and then examines internally with a clean white cloth. If the cloth is clean, the hefsek is valid and the seven days may begin the next day.
There is a fixed window for it: it must be done before sunset, not after. Missing the window means the hefsek is made the following afternoon instead, and the whole count shifts by a day — which is the single most common reason a woman finds herself a day out from where she expected to be.
Many also have the practice of a moch dachuk — a cloth inserted and left in place from before sunset until nightfall, confirming that the bleeding has genuinely stopped rather than paused. Whether, and how often, this is done varies by custom and by circumstance. Ask what applies to you.
Beginning the day after a valid hefsek Taharah, seven clean days are counted. On each of them a woman examines herself twice — once in the morning and once in the late afternoon before sunset — with a clean white cloth. These are the bedikot. It is also usual to wear white underwear and to keep white sheets on the bed through these days, so that anything appearing is seen rather than missed.
Immersion is on the night following the seventh clean day, after nightfall. Not earlier — not at dusk, not “nearly dark”. The times on the booking page are already worked out from nightfall for the date you choose, so you do not have to calculate them.
A bedikah that was forgotten, or a day where something appeared, is a question — not a verdict. Do not decide for yourself that the count is ruined and do not decide for yourself that it is fine. Both of those are rulings, and both are free to obtain from someone qualified to give them.
Ask. It is what everybody does.
Mussi Weinfeld takes these questions and will bring anything that needs a rav to one — call 408-910-2034 and ask for her, or book half an hour and choose her. You can also ask the Rabbi directly on the same number. Please do not use the website’s question form for this — that one goes to an inbox the office shares, and this should not.
This is the case the page exists to be careful about, so it gets said directly. If a bedikah cloth shows anything other than clean — a color, a mark, a shade you are not sure about — that is not yours to rule on and it is not the internet’s either. The color, where on the cloth, which day of the count, what you were doing, what medication you are on: all of it bears on the answer, and the answer genuinely does come out the permissive way a great deal of the time.
Keep the cloth. Do not throw it away, do not wash it, do not photograph it and send it anywhere. Put it somewhere flat and dry, note the date and the time of day, and ring. A rav looks at cloths; it is an ordinary part of the work, it is handled without your name attached if you would rather, and nobody is embarrassed but you — briefly, and less each time.
The same applies to a stain found on underwear or on a sheet rather than on a bedikah cloth. Different rules apply to those than to a bedikah, which is exactly why guessing is the wrong move in either direction.
Nothing may come between the body and the water. Anything stuck to the skin or covering it is a chatzitzah, an interposition, and it invalidates the immersion. So preparation is a careful, unhurried going-over: bathing or showering, washing and combing out the hair, cutting and cleaning the nails, removing every trace of make-up and nail polish, taking off jewellery, contact lenses and anything else that is on you, and then checking yourself over.
It is traditionally given an hour, and the hour is the point — it is meant not to be rushed. Preparation can be done at home and finished at the Mikvah, or done entirely there. The step-by-step is on the preparation page.
Anything permanently or semi-permanently on the body is its own question with its own answer: stitches, a cast, a filling, a crown, a wig, braces, a wound, a splinter, a nursing mother’s cracked skin, a recent tattoo, a permanent retainer, gel nails. Some of these are chatzitzah and some are not, and the difference is not intuitive. Ask before the night, not on it.
In the water, the whole body has to be surrounded at once — every hair under, nothing pressed flat against the floor or the wall, nothing held closed. The position is loose rather than tight, which is why an attendant is there: she confirms that the immersion was complete, which is not something you can see for yourself.
A blessing is said over the immersion. Practice as to when and how many times a woman immerses varies — Chabad custom differs in its details from other Ashkenazi custom — and the attendant will tell you what is done here. You do not need it memorized and nobody expects you to have it by heart; say so and you will be helped through it.
The immersion itself takes well under a minute. What a first night is actually like, start to finish, is on the visiting page.
Alongside the count there is a second calendar: the days on which the next period might be expected, worked out from previous months. On those days a couple is careful, and a woman examines herself. Working out which days those are is mechanical once you know how, and genuinely confusing until somebody shows you — the Hebrew date, the interval, the time of day all come into it.
Most women keep a small record, on paper or in an app made for it. If you have never set one up, that is a twenty-minute conversation and then it is done.
Not an exhaustive list, and not a list of unusual events. Most of these happen to most women:
None of these is a failure and none of them is rare. A rav who takes these questions has taken every one of them many times, in the same week, from women he sees at Kiddush on Shabbat and does not mention it to.
This page is an outline. What women actually do is learn it once, thoroughly, from a person — a few conversations before a wedding, or the same conversations later in life if that is when you come to it. It covers the harchakot, the counting, the bedikot, the calendar, and the whole set of things that are easier to ask about out loud than to look up.
There is no charge for that and no assumption behind it about how observant you are or intend to be. To arrange it, ask for Mussi Weinfeld: 408-910-2034, or book a time.
Ask. It is what everybody does.
Mussi Weinfeld takes these questions and will bring anything that needs a rav to one — call 408-910-2034 and ask for her, or book half an hour and choose her. You can also ask the Rabbi directly on the same number. Please do not use the website’s question form for this — that one goes to an inbox the office shares, and this should not.
Written as an outline of mainstream Ashkenazi and Chabad practice. Where customs differ it says so; where a case is individual it says to ask, and means it.
Preparation, step by step
What a first visit is like
Book a time